Perindopril is a long-acting angiotensin-converting enzyme (ACE) inhibitor that is used to treat cardiovascular conditions. It is commercially available as arginine and tert-butylamine (also known as erbumine) salts. This year, M. Teresa Duarte and her colleagues in Portugal used single-crystal X-ray diffraction spectroscopy to determine the structures of two perindopril erbumine polymorphs and a previously unknown hydrated form.
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